Android(安卓)实现View中添加子元素的动态效果

挤出点时间迅速把这篇博文完成。

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1. 在 Android3.0+ 平台下可以直接使用 LayoutTransition 类实现上图效果（笔者随手制作的gif，见谅见谅），实现代码：

package com.soxfmr.anim;import android.animation.LayoutTransition;import android.content.Context;import android.util.AttributeSet;import android.widget.RelativeLayout;public class Container extends RelativeLayout {public Container(Context context, AttributeSet attrs) {super(context, attrs);LayoutTransition transition = new LayoutTransition();this.setLayoutTransition(transition);}}

接下来直接调用 addView 添加子元素即可看到效果。

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2. 如果app支持到 Android2.1 平台，那么 LayoutTransition 就无法使用，通过 Animation 实现上图效果：

package com.soxfmr.anim;import android.content.Context;import android.util.AttributeSet;import android.view.animation.AlphaAnimation;import android.widget.RelativeLayout;import android.widget.TextView;public class Container extends RelativeLayout {private Context mContext;public Container(Context context, AttributeSet attrs) {super(context, attrs);mContext = context;}public void addview() {TextView item = new TextView(mContext);//set the animation effects to the itemAlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);alphaAnimation.setDuration(800);//add the item to parent view while starting animationitem.startAnimation(alphaAnimation);this.addView(item);}}

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3. 结合代码，以适应不同平台：

package com.soxfmr.anim;import android.animation.LayoutTransition;import android.content.Context;import android.os.Build;import android.util.AttributeSet;import android.view.View;import android.view.animation.AlphaAnimation;import android.widget.RelativeLayout;import android.widget.TextView;public class Container extends RelativeLayout {private Context mContext;private boolean bAnimMode = false;public boolean isbAnimMode() {return bAnimMode;}/** true is open the animation effects. */public void setbAnimMode(boolean bAnimMode) {this.bAnimMode = bAnimMode;}public Container(Context context, AttributeSet attrs) {super(context, attrs);mContext = context;//If the platform is Android3.0 upperif (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {final LayoutTransition transition = new LayoutTransition();this.setLayoutTransition(transition);    }else {    setbAnimMode(true);    }}public void addview() {TextView item = new TextView(mContext);refreshView(item);this.addView(item);}public void refreshView(View item) {if( ismAnimMode() ) {//set the animation effects to the itemAlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);alphaAnimation.setDuration(800);//add the item to parent view while starting animationitem.startAnimation(alphaAnimation);}}}

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